package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.entity.Setmeal;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.exception.SetmealEnableFailedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.result.Result;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.web.bind.annotation.RequestParam;

import java.util.ArrayList;
import java.util.List;

@Service
public class DishServiceImpl implements DishService {

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private DishFlavorMapper dishFlavorMapper;

    @Autowired
    private SetmealDishMapper setmealDishMapper;

    @Autowired
    private SetmealMapper setmealMapper;


    /**
     * 新增菜品
     *
     * @param dishDTO
     */
    @Transactional
    public void saveWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);
        //向菜品表插入一条数据
        dishMapper.insert(dish);
        //向口味表插入N条1数据
        Long dishId = dish.getId();
        List<DishFlavor> flavors = dishDTO.getFlavors();
        flavors.forEach(dishFlavor -> {
            dishFlavor.setDishId(dishId);
        });
        dishFlavorMapper.insertBatch(flavors);


    }


    /**
     * 菜品分页查询
     *
     * @param dishPageQueryDTO
     * @return
     */
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        PageHelper.startPage(dishPageQueryDTO.getPage(), dishPageQueryDTO.getPageSize());
        Page<DishVO> dishPage = dishMapper.pageQuery(dishPageQueryDTO);
        long total = dishPage.getTotal();
        List<DishVO> records = dishPage.getResult();
        return new PageResult(total, records);
    }

    /**
     * 菜品的批量删除
     *
     * @param ids
     */
    @Transactional
    public void deleteBatch(List<Long> ids) {
        //判断当前菜品是否起售
        for (Long id : ids) {
            Dish dish = dishMapper.getById(id);
            if (dish.getStatus() == StatusConstant.ENABLE) {
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }
        //判断菜品是否关联套餐
        List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(ids);
        if (setmealIds != null && setmealIds.size() > 0) {
            throw new DeletionNotAllowedException(MessageConstant.CATEGORY_BE_RELATED_BY_SETMEAL);
        }

        //删除菜品
        for (Long id : ids) {
            dishMapper.deleteById(id);
            dishFlavorMapper.deleteByDishId(id);
        }
    }


    /**
     * 根据id查询
     *
     * @param id
     * @return
     */
    public DishVO getByIdWithFlavor(Long id) {
        Dish dish = dishMapper.getById(id);
        List<DishFlavor> dishFlavors = dishFlavorMapper.getByDishId(id);
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish, dishVO);
        dishVO.setFlavors(dishFlavors);
        return dishVO;
    }

    /**
     * 修改菜品
     *
     * @param dishDTO
     */
    @Transactional
    public void updateWithFlavor(DishDTO dishDTO) {
        //修改基本菜品数据
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);
        dishMapper.update(dish);
        //修改菜品口味 1.删除 2.添加
        dishFlavorMapper.deleteByDishId(dishDTO.getId());
        List<DishFlavor> flavors = dishDTO.getFlavors();
        flavors.forEach(dishFlavor -> {
            dishFlavor.setDishId(dishDTO.getId());
        });
        dishFlavorMapper.insertBatch(flavors);
    }

    /**
     * 根据分类id查询菜品
     *
     * @param categoryId
     * @return
     */
    public List<Dish> list(Long categoryId) {
        Dish dish = Dish.builder()
                .categoryId(categoryId)
                .status(StatusConstant.ENABLE)
                .build();
        return dishMapper.list(dish);
    }

    /**
     * 条件查询菜品和口味
     *
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d, dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }


    /**
     * 起售禁售菜品
     *
     * @param status
     * @param id
     * @return
     */
    public void startOrStop(Integer status, long id) {
        //停售菜品时，判断这个菜品是否在那个套餐里面，否则无法停售。
        if (status == StatusConstant.DISABLE) {
            //select a.* from dish a left join setmeal_dish b on a.id=b.dish_id where b.setmeal_id=?
            List<Long> list = new ArrayList<>();
            list.add(id);
            List<Long> setmealIdsByDishIds = setmealDishMapper.getSetmealIdsByDishIds(list);


            if (setmealIdsByDishIds != null && setmealIdsByDishIds.size() > 0) {
                Long aLong = setmealIdsByDishIds.get(0);
                Setmeal setmeal = setmealMapper.getById(aLong);
                Integer status1 = setmeal.getStatus();
                if(status1==StatusConstant.ENABLE)
                throw new SetmealEnableFailedException(MessageConstant.DISH_BE_RESTOP_BY_SETMEAL);
            }
        }
        Dish dish = Dish.builder()
                .id(id)
                .status(status)
                .build();
        dishMapper.update(dish);

    }
}
